不同密度落叶松人工林直径结构研究  

The research on the diameter structure of plantation of Korean Larch with different density

作　　者：王方[1] 郑小贤[1] 蒋桂娟[1] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083

出　　处：《内蒙古林业调查设计》2011年第5期9-11,15,共4页Inner Mongolia Forestry Investigation and Design

基　　金：国家十一五科技支撑课题(编号2006BAD03A0804)长白山天然林生态采伐和次生林结构调整及多目标经营技术专题

摘　　要：文章利用汪清林业局金钩岭林场落叶松人工林不同密度固定样地的长期观测数据,采用偏度、峰度、直径变动系数对林分直径结构动态变化规律进行了探讨,结果表明:①25a时偏度值随密度增加而增大,其后随着年龄增加,各样地的偏度值均逐渐减小,直径分布曲线右偏型逐渐减弱,期初密度大的样地偏度值变化明显;②随着年龄的增加,不同密度样地的峰度值逐渐减小,直径分布曲线逐渐变得平缓,期初密度大的样地尤其明显;③31a后,各样地直径变动系数稳定在0.36附近。Long - term observation data about larch which is from Jingouling wood farm, Wangqing for- estry bureaus was used in this paper. Skewness, kurtosis and coefficient of variation were adopted to analyzing the dynamics of the diameter structure of the forests with different density. The results indicated：（1）The skewness of the distribution curve of the diameters increased as the forests＂ density went up the they were at the age of 25a. And as the age increased, the skewness of the distribution curve of the diameters decreased, right - skewed degree of the distribution curve diminished gradually. The skewness of the sample plot with lager initial density changed apparently. （2）As the age grew, the kurtosis of the sample plots diminished gradually, and the distribution curves dropped off. The change was very apparent in the sample plots with bigger initial density. （3） The coefficient of variations of the sample plots stabilized near 0.36 when the age arrived 31 a.

关 键 词：落叶松人工林 直径结构 动态变化 密度 

分 类 号：S791.22[农业科学—林木遗传育种]